IST: India Standard Time
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IST to BST: convert India Standard Time to British Time
In January, BST is 5:30 hours behind IST. In July it is 4:30 hours behind. The gap moves because the two regions handle daylight saving differently.
IST also abbreviates Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1). These pages use the Indian meaning.
The United Kingdom uses GMT in winter and BST (British Summer Time) in summer. BST also abbreviates Bangladesh Standard Time (UTC+6).
One instant, two local clocks
Drag one day across both zones
Shared instant12:00 UTC
Difference nowBST is 5:30 hours behind
ISTIndia Standard Time
17:30Thu, Jan 15
BSTBritish Time
12:00Thu, Jan 15
Approximate daylight 09:00 to 17:00 Selected local time
Both lanes show the same instant. Local dates, daylight, and offsets come from each IANA zone on the selected date, so daylight saving changes are included.
Right now
BST: British Time
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Local times come from your browser's IANA time zone data.
IST to BST hour by hour
Two columns because the gap changes with daylight saving: use the January column roughly November to mid-March, the July column mid-March to October. Exact switch dates vary by year.
| IST | BST (January) | BST (July) |
|---|---|---|
| 12:00 AM | 6:30 PM (prev day) | 7:30 PM (prev day) |
| 1:00 AM | 7:30 PM (prev day) | 8:30 PM (prev day) |
| 2:00 AM | 8:30 PM (prev day) | 9:30 PM (prev day) |
| 3:00 AM | 9:30 PM (prev day) | 10:30 PM (prev day) |
| 4:00 AM | 10:30 PM (prev day) | 11:30 PM (prev day) |
| 5:00 AM | 11:30 PM (prev day) | 12:30 AM |
| 6:00 AM | 12:30 AM | 1:30 AM |
| 7:00 AM | 1:30 AM | 2:30 AM |
| 8:00 AM | 2:30 AM | 3:30 AM |
| 9:00 AM | 3:30 AM | 4:30 AM |
| 10:00 AM | 4:30 AM | 5:30 AM |
| 11:00 AM | 5:30 AM | 6:30 AM |
| 12:00 PM | 6:30 AM | 7:30 AM |
| 1:00 PM | 7:30 AM | 8:30 AM |
| 2:00 PM | 8:30 AM | 9:30 AM |
| 3:00 PM | 9:30 AM | 10:30 AM |
| 4:00 PM | 10:30 AM | 11:30 AM |
| 5:00 PM | 11:30 AM | 12:30 PM |
| 6:00 PM | 12:30 PM | 1:30 PM |
| 7:00 PM | 1:30 PM | 2:30 PM |
| 8:00 PM | 2:30 PM | 3:30 PM |
| 9:00 PM | 3:30 PM | 4:30 PM |
| 10:00 PM | 4:30 PM | 5:30 PM |
| 11:00 PM | 5:30 PM | 6:30 PM |
Scheduling a call between IST and BST
Standard business hours (9:00 AM to 5:00 PM) overlap in January from 2:30 PM to 5:00 PM in IST, which is 9:00 AM to 11:30 AM in BST.
In July the overlap runs 1:30 PM to 5:00 PM in IST (9:00 AM to 12:30 PM in BST).
More IST conversions
Offsets are computed from the IANA time zone database for January 15 and July 15 of the current year. IST here means India Standard Time (India); BST means British Time (United Kingdom).